James Pan

原题网址：https://leetcode.com/problems/zigzag-iterator/ Given two 1d vectors, implement an iterator to return their elements alternately. For example, given two 1d vectors: v1 = [1, 2] v2 = [3, 4

原题网址：https://leetcode.com/problems/zigzag-conversion/ The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a

原题网址：https://leetcode.com/problems/rotate-image/ You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up: Could you do this in-place?

原题网址：https://leetcode.com/problems/spiral-matrix/ Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example, Given the following mat

原题网址：https://leetcode.com/problems/spiral-matrix-ii/ Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3, You should retu

原题网址：https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/ Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right